{{ email_field('email', "class": "form-control") }}
For some reason, this bombs Phalcon with a 500 error: "PHP Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW)"
Removing "class": "form-control" stops the error. For whatever reason, it looks like the email tag does not support other attributes? This doesn't occur on any other tag (converting this to a text_field worked fine).